Brush-block-boring machine



(ModeL) V V V q J. 0. HALL & 0. A4MAHLE.

BRUSH BLOCK BORING MACHINE.

' No.284,128. Pat nfied Aug. 1883 N. FETERS. Pholuillhngriphgr. Washinflon. n.c.

UNITED STATES PATENT -O FFICEO JOHN C. HALL AND CLEMENGE A. MAHLE, OF COREY, PENNSYLVANIA. v

BRUSH-BLOCK-B'ORING MACHINE.

SPECIFICATION forming part of Letters Patent No. 284,128, dated August 28, 1883. Application filed March 27, 1883. (ModeL) To all whom itmay concern:

Be it known that we, JOHN CCHALL and OLEMENO'E A. MAHLE, of the city of Corry, in thecounty of Erie and State ofPennsylvania,

' have, invented certain new and useful Improver5 brush-b1ock-boring machines; and it consists in the eolnbinationof the drivingshaft, provided with a suitable pulley, with the shaft for the carrier-plate, which passes eccentrically through it, so as to give-the necessary motion to the driving-plate, andat the same time form a long bearing for the shaft which operates the plate, as will be more fully described hereinafter. I a

The object of our invention is to make the driving-shaft operate the shaft which carries the carrier-plate, and thus do away with the usual crank or wrist which has heretofore been used, and to give the shaft which carries the carrier-plate a long bearing, so as to pre- 3o vent it from heating.

Figure l is a side elevation of our invention complete. Fig. 2 is an end view of the same.

A represents a frame of any'suitable shape,

size, or construction that may be preferred,

3 5 and which has the bearings B formed upon its I top for the driving-shaft O. This drivingshaft will preferably be provided with a driving-pulley, D, and a balance-wheel, E, upon its inner end, as shown. Bored through thisshaft, to one side of its center is a suitable hole .or opening, in which is placed the shaft G, which has the carrier-plate H attached to its inner end. As the drivingshaft is made to revolve, this shaft G is carried around with it and through a circle just large enough to give the carrier-plate its required motion. By this construction a long bearing is formed for the shaft G. The ordinary crank which has here-' tofore been used is done away with, and the heating of the operating parts is prevented. The bearing for the boring-rods is held in a suitable frame, and at one end of the frame A is placed a suitable slide, I, upon which the brush-block is to be placed, and this slide is connected to a spring-actuated lever, J. This lever J is operated in turn by means of the crank-lever O, by means of which the brush block is forced against the revolving rods.

In the patent granted to us December 17, 1878, a single shaft having a crank formed on one end for moving the disk H is shown; but the trouble with this construction is thattlie crank forms too long a bearing and is apt to become bent. By inclosing the shaft G, as is here shown, it can never become bent, and when worn out the shaft has only to be removed and another one inserted.

Having thus described our invention, we clai1'n In a brush-block-boring machine, the combination of the driving-shaft with the shaft which carries the carrier-plate, the'carrierplate shaft being passed throughthe drivingshaft to one side of its center, substantially as described. i

. In testimony whereof we affix our signatures in presence of two witnesses.

JOHN C. HALL. CLEMENGE A. MAHLE.

- WVitnesses:

ALBERT TRUEsDELL, R. E. GLASS, G. H. RANDALL. 

